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Interest expense (Details) - CAD
CAD in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Schedule of Interest Expense [Line Items]    
Amortization of deferred financing costs CAD 797 CAD 572
Interest on long term debt 7,087 5,978
Other interest income (144) (194)
Total interest expense, net 6,943 5,784
Capital lease obligations    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 3,023 2,836
Credit Facility    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 1,507 1,593
Debentures | Series 1 Debentures    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 0 977
Convertible subordinated debentures    
Schedule of Interest Expense [Line Items]    
Interest on long term debt 1,760 0
Amortization of deferred financing costs CAD 344 CAD 410